For our product I need a unique serial number in the format SNxxx. This product contains several article that have a LOT number. If we receive a shipment with several articles I have to check in each type of article with a new LOT number (e.g. 1001). E.g. I get 100 pices of article A and all this are check in as LOT 1000. The LOT number should have a number generator, each time I used a new one I should get a new LOT number.

I am using OpenERP V7 (Version 7.0-20140804-231303).